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How to use SIZEX variable

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Just one quick question here... I cannot get the $SIZEX Y and Z variables to work for me.

I am using the points from volume SOP to get a grid of points in a box. Now I want to have approximately the same number of points regardless of the boxe's size, so in the separation box I am trying to get $SIZEX (the box is more or less the same size in all dimensions), so I can calculate a separation that will give me (say) 200 points.

Whenever I enter $SIZEX, the variable doesn't turn yellow to indicate it is 'good', and the node turns red (when I middle click, the red goes away but still no points). What do I need to do to get this working?



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